rule of thumb
The term "rule of thumb" refers to a broadly applicable principle or guideline derived from practical experience rather than strict theory or precise measurement.
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Definition
B2General Use
(informal)A broadly applicable principle or guideline derived from practical experience rather than strict theory or precise measurement.
Example
- As a rule of thumb, you should save at least 20% of your income.
- A good rule of thumb is to drink eight glasses of water a day.
Similar
Terms that have similar or relatively close meanings to "rule of thumb":
golden ruleground rulerule of the roadhouse rulebright-line rule